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Old 04-25-2012, 09:45 PM   #29
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Concrete

Has anyone ever sent a sample to an independent lab to confirm that you got what you payed for? You can also do this after the fact. One of the most common scams is the driveway resurfasur. Talk to your local LEOS!!!
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Old 04-25-2012, 09:56 PM   #30
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Quote:
Originally Posted by Elkhartjim View Post
Concrete hardens and gains strength as it hydrates. The hydration process continues over a long period of time. It happens rapidly at first and slows down as time goes by. To measure the ultimate strength of concrete would require a wait of several years. This would be impractical, so a time period of 28 days was selected by specification writing authorities as the age that all concrete should be tested.

Concrete hardens harder if allowed to hydrate slowly. Thats why the Texas highway department covers new pours with wet burlap to slow the hydration process during the hot summer months. Thats why I keep a sprinkler on my slabs for two or three days after a pour. Thats why they use tons and tons of ice in foundation pours for multi-story buildings to cool the chemical reaction and slow the hydration process.

All concrete develops hairline cracks during the curing process. Cracking is usually attributed to inferior soil preparation. You can pour a slab on black gumbo soil and never step on it and it can break due to the soil movement.

Check with any Civil Engineer for verification.

One easy test. Pour a test sample and take a sledge hammer to it in a few days. It'll easily break. Now go out and try to bust the corner off your 20 year old sidewalk.

Another thought. How often do you see cracked concrete pads at RV parks? Do you think they go to the expense of pouring 6" slabs?
Why are you quoting me? I was referring to post #9 about old concrete not being as good as new concrete.

I have the equiv of a Masters in Civil Engineering and an AA in Computer Managed Information Systems BTW.
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Old 04-25-2012, 11:46 PM   #31
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Old cement, please read it correctly.
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Old 04-26-2012, 12:28 AM   #32
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No one mentioned anything about the "what if's" of putting down the leveling jacks

This was the reason we passed on parking the RV at a home where we visited over spring break. Chose an RV park instead...no hurt feeling that way.

I think everyone convinced the originator to pass on the idea...but just another point to add to the conversation. I'm no Civil Engineer, but don't cha' agree that would be a big no-no if using a friends driveway because of the smaller contact patch, especially for the rear end.

So, does anyone know what the typical RV Park has for their spots?

Just wondering
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